Source : https://github.com/joliss/jquery-ui-rails#i18n

To change the translation of the datepicker, just add this require in active_admin.js.coffee : 
```coffee
#= require jquery-ui/i18n/datepicker-pt-BR
```

List of available translations : 
https://github.com/joliss/jquery-ui-rails/tree/master/app/assets/javascripts/jquery-ui

#### Custom date format

    f.input :my_date_field, as: :datepicker, datepicker_options: {dateFormat: 'dd/mm/yy'}

In order to always return an ISO formatted date to the server when form submitting (and displaying the given date format to the user), this input do the job :

https://gist.github.com/fabien-michel/bdf427d4f9e6259d3dc2#file-datepicker_input-rb
